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Heat the grill to high. Boil the potatoes for 15-20 mins until tender.
Meanwhile, rub the lemon zest and a little of the oil over the lamb chops and tomatoes and season, if you want. Grill the tomatoes and lamb on a baking tray for 8-10 mins until golden, turning the lamb over half way through cooking. Cover with foil and leave to rest.
Drain the potatoes. Using the same pan, fry the garlic briefly in the remaining oil. Tip in the potatoes and crush roughly with a masher until the skins split. Stir in the spinach and cover for a few mins until the leaves wilt. Season to taste, then serve with the lamb and tomatoes, spooning over any cooking juices.